Fuse-switch.



T. E. MURRAY.

FUSE SWITCH.

@PPLIGATION FILBD11oV-2s, 1913,

1 1 1 2, 1 56. Patented sept. 29', 1914.

miem/w13 THOMAS n. MRRAY, or New YORK, 'u Y,

Specification of Letters 'tent.

Patented sept. '29, 1914.

Application filed November :28, 1913. Serial No. 803,370.

To all whom it may concern: i

Be it known that I, THOMAS E. MURRAY, a Citizen of the United States,residing at New York,` in the county ofI New York and State' of New,York, have invented a certainnewy and useful Improvement' in. Fuse-Switches, of lwhich the 'following is a specification. r

The invention isa fuse switch of simple .'construction, in whichparemovable cylindrical cartridge fuse'case coperates with contactsdisposed in a tubular casing. The tuse iOng a longitudinallygrooved arm8 which case or plug is provided with an insulating handle, by which itmaybe introduced into or removed from the casing..

In the accompanying dr'awings-Figure 1 is a longitudinal section of myfuse switch. Fig. 2is a cross section on the line A, A ot Fig. 1. Fig. 3is a bottom view of the insulating block.

Similar numbers of reference indicate like parts.

The tubular metal casing comprises a 4body portion 1, screwed at itsends into sleeves 2, 3, and side projections 4, 5 screwed into offsetson the walls ot said sleeves.

Within the body portion lis a tubular lin` ing 6 of insulating material,closed at its' upper end. Within. said closed endl is dise osed aninverted cupfshaped'contact 7, hav- 1 enters projection 4 throughanopening in lining 6. Above the arm 8 is a plate 9 of insulatingmaterial, shaped, as shown in Fig. 3, to lit upon arm 8 and to rest uponthe closed end of lining 6. Above the plate 9 may be a spacing block 10of insulating matcr1al,upon which bears a screw plug l1 entering theupper extremity 'of sleeve 2. Also in projection 4 is an insulatingblock 12 `grooved to receive a grooved metal plate 13 lower part, oflining 6 is an annular Contact 19, having anarm 20 which entersprojection 5 through an opening in said lining and is shaped similarlyto arm 8. Above enten* sion 20 is an insulating block 21, secured inplace by screw 22. rThe other circuit terlniinal 23 is"received betweenarm 20 and plate 18.

24 is a cartridge fuse case, having the usual metalv end caps 25,26.Said fuse case is secured to a handle 27 -of insulating material by ascrew 28 countersunk in said handle. On the exterior of sleeve 3 arespring hooks 29 which engage with afiange 30 on said handle.

When it is desired to bring the fuse into circuit, the Jfuse case 24,by-means of handle 27, is inserted as a plug into body portion 1 untilend cap 25 is seated in contact 7, when end cap 26 registers withcontact 19, thus completing circuit from one terminal, as 14, throughthe fuse to the op osite terminal 23.

In the embodiment o my device here shown, the hooks 29 first entervertical recesses 3 1 in the edge of ange 30 and then entercircumferential recesses having upperV inclined undercut edges 32. Byrotating the handle, 4the edges 32 running over the hooks ends jam theupper end cap of fuse case 24 tightly into contact 7 thuslocking theplug in place.V

-4 It is to be particularly noted that when the fuse 1s blown, or forany reason requires attention, the fuse case' or plug is wholly removedfrom its inclosing casing, and away from all live connections. To'substitute a new fuse case, all that is required is to release thescrew 28 holding the old one to the handle, and connect the new one tosaid handle by the'same screw.

I claim:

1. A tubular casing, a cup-shaped contact and` an annular contactdisposed within said casing, a cylindrical fuse plug received in andhaving external contacts cooperating with said casing Contacts, hooks'on said casing, and a flange on said plug having 'in its edgecircumferential recesses cooperating with said hooks upon the rotationof said plug to force the end of said plug into said cup-shaped contact;

2. casing having a tubular body portion and ltubular projectionsextending laterally therefrom, fixed contacts in said body portion, armson said contacts extending into said projections, means in saidprojtctions Jor connecting said arms to circuit terminals, and aremovable cylindrical fuse plug received in said body portion and havingexternal contactsrcoperating with said fixed Y contacts.

3. A tubular casing, contacts therein, a

removable cylindrical fuserplug received in In testimony whereof I haveaixed my said Casing sind having 'external contacts cosignature inpresence 'of two Witnesses.

operating with said casing contacts, a flange on said plug abuttingagainst the circumfer- THOMAS E MURRAY' 5 ential edge of said casing,and hooks on said lVitnesses:

casing engaging said ange and holding i GERT'RUDE T. PORTER, said casingand plug contacts in coperative MAY T. MCGARRY. ,f relation.

